Furnace for steam-generators.



J. RAMAGHER. FURNACE FOR STEAM GENERATORS.

APPLICATION FILED APR. 29, 1912.

' Patented Oct. 28,1913.

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UNITED STATES rnrrnnr QFFIQE- recon RAMAGHER, or nnLLB'RiioK, BEZ., COLOGNE, GERMANY, AssIGricR '10 WALTER GARTNER, or HAIIBURG, GERMANY.

FURNACE FOB STEAM- GENERATORS.

Specification of Letters Patent. Pate td Oct. 28, 1913.

Application filed April 29, 1912. Serial N 0. 693,852.

To all whom, it may concern:

Be itknown that I, JACOB RAMACHER, a subject of the Emperor of Germany,.:residing at Dellbriick, Bea, Cologne, Germany,

have invented certain new and useful Improvements in Furnaces for Steam-Genera tors,

This invention relates to furnaces for steam generators of the type in which the fuel is fed laterally to the fire grate through hoppers arranged oneither'side of thegrate.

In such furnaces the fuel is partially coked before being delivered to the grate where combustion takes plabe and fire brick cheeks or partitions have hitherto been provided above the grate on eitherside'thereof to restrict the, passages through which the fuel is fed and by being heated, serving to assist in the coking of the fuel before it reaches the grate. Such partitions or cheeks, which hitherto have been employed in connection with fire tube steam generators, are found in practice to become overheated, ,with the result that the fuel is coked to a greater eX- tent than is desirable, and the object of the present invention is to provide means whereby the rate or degree of coking can be modifled to suit requirements, provision being also made to prevent those portions of the partitions which are in contact with the fuel on its way to the grate from being overheated.

According to thisinventio'n two sets of air chambers or conduits are provided on each side of the grate, one set of chambers being formed in the fire proofv partitions and supplied w1th cold am, not previously --heated in any way, to cool the back of'each partition where the latter is in contact with the fuel-and soprevent coking taking place beyond the desired extent, the other set of air conduits being formed below the fuel passages and serving to supply warmair thereto for the purpose of assisting the coking, dampers being provided to regulate the amount of warm air thus admitted. After cooling the back of the fire-proof partitions the air is led through further passages into the combustion chamber where it arrives in a warm state and assists combustion in the known manner, the prnnary ObJGCl', of the cmshng chambers communntatlng with the combustion chamber being to induce a i'uri thornew of cold air through the cooling of which the following is a specifica-' prevent coking beyond thefuel chambers.

chambers to retard or the required point in The main supply of fuel ateach side of valve which can be intermittently opened in the known manner to allow the fuel to fall into the coking chamber and fuel sup ply passages. In the accompanying drawings which show one form of air cooled partition according to this invention applied by way ofv exampleto a steam generator of the known central flue type, Figure 1 is a transverse vertical section through a steam generator furnace modified in accordance with thepresent invention. Fig.2 is a longitudinal vertical section through the same, and Fig. 3 is a transverse vertical section through a water-tube steam generator, also according to this invention. Figs. 4 and 5 are detail views, on an enlarged scale, of a form of damper for regulating the supply of air to the fuel.

The invention is illustrated in Figsl and 2 as applied to a steam generator of the known type comprising a curved grate. A disposed directly below an opening B 1n the boiler shell B which is provided with alongitudinal flue C. The grate is connected in the known manner by inclined passages D with fuel hoppers D disposed on each side of the shell andthe flue C is connected to the shell by a ring E of angle section.

On the underside of the boiler shell are arrangedrefractory cheeks or partit ons F .Which, in the known manner, restrict the grate and in this construction serve to pro tect the rivets which connect the ring l) to the boiler shell. The fuel is delivered to the grate A behind the partition l bring coli'ed to a greater or loss extent before it reaches the grate. In each partition F are formed oneor more longitudinal air passages, one passage ll being arranged at the bark of the partition and formed of cast iron or like l'nalcrial lot into the partition. This passage ll'is connected by one or ,more transversp conduits ll with a second approximately "ronlral air passage ll also formed of cast iron and having one or more.

horizontal openings l The. openings b" extend to the combustion rhalnlvrr and so 1 allow air from outside. the iurnaco to pa "passage through whichthe fuel is fed to the bv opening a valve Gr. of the known type.

vided which'enable the supply of air to be chamber and heated air will be suppliedto 1- the combustionchamber, and additional air: supply conduits ,arrangedg-to supply air to longitudinal passage K to which air is supplied from below.

lateral air passages K or hollow grate bars of the walls L of the generator, the refrac tory partitions F as before, having air passages H, H, H The watertube boiler shown has. a bafiie M disposed} above the fire grate and the first two rows of water tubes N, theproducts of combustion subsethrough the passages I-I, H H to the space above the grate where it assists in combustion in the usual way. By forming the back of each partition hollow as above described and by so inducing a constant flow oficold air to the" furnace, not'only. is the latter supplied with warm combustion air as is well' known but the back portion of around and between the remain ng water each partition is maintained at a low temtubes 0 as in the" usual type of Babcock and perature thus preventing the fuel in contact Wilcox water tube steam generator. I therewith on its way to the grate, being What I claim as my invention and d'esire prematurely coked owing to the heat of the to secure by Letters Patent iS:-' v V partitions or by the fire on the grate work- In a furnace for steam generators,-. the ing upward. combination of a fire grate, a

The main supply of fuel in the hoppers D: chamber, fuel supplyv passages at oppositeis allowed to fall into the fuel passages sides of the grate, a. refractory partition The fuel then descends between the back of the partitions and an inclinedwall J to the grate. On the lower part of the wall} J and between it and the grate is formed a close to the outer face of the partition and nace and the other situated between and The air from this pas- 4 age issues t rough elongated taperedopenings K into the coking chambers on. eitherside of the grate and dampers K are proregulated. In this way the amount of' air which passes through the coked fuehcan be adjusted and thus the degree and rate at which coking takes place can be regulated.

Fig. 8 shows the invention applied to a water tube boiler. The fire grate A may be similar to that already described and have .the'fuel on either side of the grate.

' In testimony'whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' lVitnesses:

' LOUIS VANnomr, J. THRSONBEREND.

of known construction may be used. The fuel hoppers are arranged at either side quently, after striking these tubes l l flowing forming one Wall of each'fuel passage and having therein t'wo chambers, onesituated,

communicating ,with both "said-vain inletchamber and the ycombustioh chamber, 'whereby excessiveheating of the wall ofthe fuel passage, formed by said partition will be prevented by the'cool air within the' inlet.

combustion:

*extending through he end wallof the fur-"- aoonnaiiaonnn.

Copies. of this patent maybe obtained for. five cents" each, by addressing the Commissioner of Iatentn- Washingtoml). G." 

